Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a1d84a5b68c2b6…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 19:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a51009edb1c1525b2d267cad9324920a SHA-1: 5adb2e49b14ae9aa22e9d6ce8d0225e4fb479d96 SHA-256: c0a1d84a5b68c2b6b1d8afa6e6142086a14009eba996a5f5aa457c5ea3bc7fbd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a phishing campaign, potentially using embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://moveworldtogether.com/datas/files/gegowulajizu.pdf In PDF document text
    • http://3qbuy.com/CKEdit/upload/files/34732958680.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///20219285644706.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/77641702044.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/rolubiburubuviromebalon.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/98301050993.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/75276815771.pdfIn PDF document text
    • https://subded.org/userfiles/file/65389294364.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/jumoguwepired.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/pijufifoxomujesek.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/90377718287.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7bb8c2e18814d582443be9790a646ad5/34879342917.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109190723276731.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/ledotepod.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161426629e09ad---52014124660.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/ruxupetobazuzufeta.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/piwawojaluviwedu.pdfIn PDF document text
    • http://ihdbd.org/upload/files/43687588070.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469e6212bb7---ruvodojebizujebafezoxuku.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/wotagu.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/rasezededunukinig.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/137203887e7b0d26263b2ff2f1207733/tewagati.pdfIn PDF document text
    • http://bociany.sk/media/file/zivisawidarasubanalewileg.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/29322099688.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109092006155911.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/60958256823.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210918225444_500234615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=note+8+vs+redmi+9tPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB0 18956 bytes
SHA-256: 11a82e3b12499f95f7fba114e5d7bbd90e9d9bdc7de3d0914a240178047f3269
font_01_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 10516 bytes
SHA-256: 72397938bcbfcd30d2120fa0510e05c754ad183c00a653f2d085761b6bf76756
font_02_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1